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EXTECH. INSTRUMENTS User Manual
Extech Model IR320
Waterproof, Dual Laser IR Thermometer with Alarm
1. Introduction
Thank you for selecting the Extech IR320 IR Thermometer. The IR320 is a professional non-contact infrared thermometer
that measures surface temperature from infrared energy radiated by the target's surface. We ship this meter fully tested
and calibrated and, with proper use, it will provide years of reliable service. Please visit our website (www.extech.com)
for the latest version of this User Manual and Customer Support.
2. Product Features
Strong and Durable: 3m (9.8 ft.) drop-proof
Dustproof and Waterproof: IP65
Ergonomic Design: Comfortable handheld, simple and convenient operation
MAX/MIN/AVG/DIF values: Quickly display the Maximum, Minimum, Average (running average updates every two
readings), and Differential (Max minus Min) values
Large Backlit LCD
Tripod mount for hands-free operation
Alarm Function: High/Low temperature alarm provides flashing color-coded LED indicators when triggered
Dual Laser Pointers: To enhance measurement target accuracy
3. Safety Instructions
� WARNING
To avoid personal injury, please read the following safety information before using this product:
• Safety Standards Compliance:
CE Identification: EN 61326-1: 2013, EN 61326-2-3: 2013
Laser Safety Standard: Complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to
laser notice no. 50 dated June 24, 2007
• Please do not point the laser toward people or animals directly or indirectly.
• Please do not look at the laser directly or through other optical tools (telescope, microscope, etc.).
• If the battery symbol on the LCD display is flashing, replace the batteries immediately to avoid
inaccurate measurements.
• Before using the product, check the product for damage. Do not use this product if obvious physical
damage is apparent.
• Refer to the Table of Emissivity Factors for Common Materials in this manual before taking
measurements. Reflective objects will cause the measured value to be lower than the actual
temperature value. Set the emissivity to match each given surface type. When measuring, please do not
touch high temperature surfaces.
• Do not use this product near explosive gases.
• To ensure measurement accuracy, place this product in the test environment for more than 30 minutes
before use.
• Avoid keeping the thermometer near high temperature objects for long periods.
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
3 IR320-en-GB_V1.0 6/18
5. Operation
Power On and Off
Pull the trigger to power the meter, the LCD (and backlight) will turn on. The thermometer will power off automatically
after approximately eight (8) seconds.
Manual Measurements
1. Pull and hold the trigger after aiming toward the target to measure.
2. The SCAN icon will flash while measuring the targeted surface or object. The center of the measurement spot is
equidistant between the two laser points (enable/disable lasers per the Lasers Enable/Disable section).
3. Read the temperature measurement on the large digits at the center of the LCD.
4. Release the trigger. The SCAN icon disappears and the HOLD icon appears, indicating that the measurement has
stopped and the display is holding the last measured value. The meter will power off automatically after approximately
eight (8) seconds.
Automatic Measurements (trigger-free)
1. Pull and release the trigger to power the meter.
2. Press the M button six (6) times; the will appear on the upper left.
3. Use the arrow buttons to turn the mode ON (or OFF).
4. Pull and release the trigger. The icon will remain ON and the SCAN icon will flash. The thermometer will
continuously measure the target temperature (without having to hold the trigger). Note that In Auto mode, the LCD
backlight will switch off after 2 minutes.
CAUTION: If you enable the lasers (see Lasers Enable/Disable), they will remain ON during the measurement scan.
5. To stop the measurement, pull and release the trigger again. The Auto measure icon and the SCAN icon will
disappear, and the HOLD icon will appear. The meter will stop measuring and will hold the last measured value on the
LCD until it automatically switches off after approximately eight (8) seconds.
MAX/MIN/AVG/DIF Values
With the meter ON, short press the RCL (Recall) button to step through the MAX/MIN/AVG/DIF modes respectively; the
display will show the value of the corresponding mode in the secondary display area (lower right). The MAX value is the
highest reading taken in a given measurement session, the MIN value is the lowest reading, the AVG value is a running
average that updates every two readings, and the differential (DIF) is the MAX minus MIN value.
Alarm Activation
With the meter ON, short press the HI/LO button to select the HI-LO alarm mode, HI-only alarm mode, LO-only alarm
mode, or no alarm mode (the display icons will inform as to what mode is currently selected: HI, LO, HI-LO, or no icons).
When you select the HI alarm mode, the HI LED will flash red when the measured temperature exceeds the high alarm
limit. When you select the LO alarm mode, the LO LED will flash blue when the measured temperature is lower than the
low alarm limit. When you select the HI-LO alarm mode, the HI or LO LED will flash depending on whether the
measured temperature is higher than the HI limit or lower than the LO limit.
HIGH and LOW Alarm Limit Setting
With the meter ON, short press the M button once to access the HI alarm screen or press M twice to step to the LO
alarm screen. Use the up/down buttons to set the alarm thresholds. Short press the up/down buttons to add or
subtract 1 unit, long press to change the units rapidly. The meter will exit the setup screen automatically after five (5)
seconds of button inactivity.
7. Emissivity Considerations
The Emissivity setting is shown in small digits at the lower left corner of the display. To adjust the Emissivity please refer
to the Emissivity Setting section. Emissivity represents the reflectivity of a material. Most organic materials and painted
or oxidized surfaces have an emissivity of approximately 0.95. Masking tape or flat black paint should be applied to
cover the measured surface. Wait a period of time to allow the tape or paint to reach thermal equilibrium with the
surface of the covered object. Measure the temperature of the surface covered with tape or paint only after
equilibrium has been achieved.
I Measured Surfaces
Metals
Aluminum Oxidization
A3003 Alloy Oxidization Rough
Brass Burnishing Oxidization
Copper Oxidization
Table of Emissivity Factors for Common Materials
I Emissivity
0.2-0.4
0.3 0.1-0.3
0.3 0.5
0.4-0.8
11 Measured Surfaces
Non-Metals
Asbestos
Asphalt
Basalt
Carbon Non-Oxidization
Electric Terminal Board 0.6 Graphite Silicon Carbide
Hastelloy Ceramics Allov 0.3-0.8
lnconel Clay Oxidization 0.7-0.95 Sand-Blasting 0.3-0.6 Electro Burnishing 0.15
Iron Concrete Oxidization 0.5-0.9 Rusting 0.5-0.7
Iron (Casting) Cloth Oxidization 0.6-0.95 Non-Oxidization 0.2 Casting 0.2-0.3
Iron (Forging) Glass Passivation 0.9 Convex Glass
Smooth Glass Lead-Boron Glass
lead Plates Rough 0.4 Oxidization 0.2-0.6
Molybdenum Stone Products Oxidization 0.2-0.6
Nickel Plaster Oxidization 0.2-0.5
Platinum Ice Black 0.9
Steel Limestone Cold rolling 0.7-0.9 Steel Plate Burnishing 0.4-0.6 Steel Plate Rubbing 0.1
Zinc Paper Oxidization 0.1
Plastics Water Soil Wood
5
Emissivity I I
0.95
0.95
0.7
0.8-0.9 0.7-0.8 0.9 0.95
0.95
0.95
0.9
0.76-0.8 0.92-0.94 0.78-0.82 0.96
0.93
0.8-0.95
0.98
0.98
0.95
0.95 0.93 0.9-0.98 0.9-0.95
IR320-en-GB_ Vl.O f{18
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
7 IR320-en-GB_V1.0 6/18
9. Specifications
Measurement Range -20oC~650 oC (-4oF ~1202 oF)
Accuracy ≥0 oC: ±1.8 oC or ±1.8% of reading, whichever is greater
< 0 oC: ±(1.8 oC +0.1 oC / oC)
≥32 oF: ±3.6 oF or ±1.8% of reading, whichever is greater
< 32 oF: ±(3.6 oF +0.1 oF / oF)
Temperature Coefficient 0.1 oC / oC (0.1 oF / oF) or ±0.1% of reading per degree, whichever is
greater
D:S Ratio 12:1 distance-to-spot ratio
Emissivity 0.1~1.0 adjustable
Response Time 250ms (95% of reading)
Spectral Response 8um~14um
Display Resolution 0.1 oC (0.1 oF)
Repeatability ±1.0 oC (1.8 oF) or 0.8% of reading, whichever greater.
Laser configuration Dual Laser
Laser Type CLASS II
Laser Wavelength 630nm~670nm
Laser Power <1mW
Battery Type 9V Battery (6F22), included
Battery Life ≥6h (operating continuously with backlight on)
Dimensions 189mm*118mm*55mm (7.4*4.6*2.2 in.)
Weight 292g (10.3 oz.)
Operating Temperature 0 oC ~50 oC (32 oF ~104 oF)
Storage Temperature -20 oC ~60 oC (-4 oF ~140 oF)
Operating Humidity < 90% RH (non-condensing)
Operating Altitude 2000m (6562 ft.)
Storage Altitude 12000m (39,370 ft.)
Water Protection Level According to IEC60529, complies with IP65
Drop Test 3m (9.8 ft.)
Safety Standards Compliance
CE Identification: EN 61326-1: 2013, EN 61326-2-3: 2013
Laser Safety Standard: Complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to laser notice no. 50 dated June 24, 2007
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
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